<html>
<head>
  <script language="javascript" type="text/javascript" src="//cdn.jsdelivr.net/p5.js/0.3.11/p5.min.js"></script>
  <script language="javascript" type="text/javascript" src="//cdn.jsdelivr.net/p5.js/0.3.11/addons/p5.dom.js"></script>
  <script language="javascript" type="text/javascript" src="sketch.js"></script>
  <style> 
    body {
      padding: 0; 
      margin: 0;
    }

    #center {
      background-color: #BBBBBB;
      position:absolute;
      top:50%;
      left:50%;
      margin: -160px 0 0 -120px;
    }
    
  </style>
</head>

<body>
  <div id="center"></div>
</body>
</html>